Oil filter cartridge mounting



Dec. 2, 1952 R, G, ZENlCK 2,620,071

`OIL. FILTER CARTRIDGE MOUNTING Filed Jan. 31, 1949 I I Irl mi' INVENTOR.

BY Zenzc'fz Patented Dec. 2, 1952 UNITED STATES PATENT OFFICE OIL FILTER CARTRIDGE MOUNTING Raymond G. Zenick, Burbank, Calif.

Application January 31, 1949, Serial No. 73,775

(Cl. ZIO- 164) 4 Claims. 1

This invention relates to oil filters for internal combustion engines, air compressors and the like and refers particularly to improved means for mounting the iilter pack within the casing of such filter.

In the present-day practice, oil ilters generally consist of a metal casing within which a cartridge is seatable and this cartridge conventionally consists of a cylindrical inner casing within which the lter pack is fully enclosed. The disadvantage of this type of lter construction is that when the filter pack becomes saturated with the gritty impurities which is designed to lter out, it becomes necessary not only to discard the lter pack but also the cartridge within which it is mounted.

In View of the foregoing, it is the general object of the present invention to provide a iilter combination within which the filter pack forms a separate unit which may be mounted within the filter casing and from which it may be removed for replacement by a new pack without having to discard any other part of the ilter. A considerable saving is in this manner elected without, in any way, reducing the effectiveness of the iiltering operations. It is a further object of the invention to provide a novel, highly ei'licient and inexpensive lter pack.

The advantages of the present invention will be better understood from the following detailed description and reference is invited to the accompanying drawings in which a preferred form of the invention is illustrated.

In the drawings:

Fig. 1 is a side elevational view of an oil filter embodying the invention and with a portion of the casing thereof broken away for the sake of clearness;

Figs. 2 and 3 are, respectively, a top and bottom view of the lower support for the ilter pack;

Fig. 4 is a substantially corresponding side view of this support;

Fig. 5 is a plan view of the upper member of the lter pack mounting;

Fig; 6 is an inverted plan view of this mounting; and

,Figa 7 is a substantially corresponding side elevational view thereof.

Referring in the first instance to Fig. 1, the numeral I denotes a cylindrical casing such as conventionally used in oil lters. This casing is open at the top and a tightly fitting cover 2 is provided to seal the top of the casing after the lter pack has been mounted therein. In the bottom of the casing is tightly seated a plug 3, through the center of which is cut a discharge passage ll. This plug is provided with internal screw threads `5 of a size to receive therein the threaded end of a tubular stem E rising through the casing and projecting a distance above the upper end thereof. Once this stem has been seated in the plug 3, it remains permanently in position therein to support the filter pack which is mounted in the manner which will now be described.

An annular shoulder IB is rigidly mounted on the stem 6 a distance above the bottom of the casing to provide a support for the lower pack supporting member II, which latter is slidably mounted on the stem and placed in position thereon before the pack is lowered into the casing. The upper pack mounting element I2 is placed in position on the stem after the filter pack has been seated on the member I I and a compression spring I3 is mounted on the stem to project a distance above the 'upper end thereof, substantially as indicated in the drawing. The cover 2 may then be placed in position to close the upper end of the casing and a screw plug Iii is inserted through a perforation in the top of the cover to engage internal screw threads within the upper end oi the stem thereby to clamp the cover rigidly and tightly in position on the casing.

Oil under pressure is, While the engine is running, forced through an inlet passage I5 into an annular chamber I6, formed between the outer surface of the iilter pack and the wall of the casing, gradually to enter into and to flow through the pack into a cylindrical inner space I'I formed between the pack and the stem 6. The ltered oil rises within this space until it reaches an aperture I8, through which it passes into the interior of the stem by gravity to discharge through the opening 4 of the bottom plug 3 for return to the engine. It is noticed that a space I9 is provided within the bottom of the casing and that the incoming oil is free to pass into this space for the purpose of heating the lower part of the casing, the bottom support member II and the lower portion of the stem B. This is found advantageous for the reason that such heating expedites the flow of the oil through the lter pack.

The lower support member II and the upper mounting member I2 are so shaped that they will tightly enclose t'he lter pack therebetween and so prevent a leakage of oil. The lower member Il is, for this purpose, made in the upper surface thereof adjacent to the outer periphery of the member with a series of circular ribs 20 rising therefrom to enter into the softer material of the filter pack and so to form a tight joint at the outer surface thereof. The upper mounting member l2 is similarly made with a plurality of ci-rcular ridges 2| at the inner end thereof adjacent a pendent shoulder 22 which serves to maintain the filter pack axially aligned with the stem 6 and the cylindrical spa-ce within the casing. The lower member l I is similarly fitted with a shoulder 23 rising into the space within the filter pack for the same purpose. The upper member is made with a plurality of equidistantly spaced radially directed grooves `24, through which the oil is free to flow into the upper surface of the filter pack. Similar grooves 25 extend radially inward from the circular ribs 261 and along the shoulder 23 into the inner space l1.

The spring I3 applies sufficient pressu-re to the upper mounting member I2 to `maintain the filter pack firmly and tightly seated between theci-rcular ridges of the two members and suitable gaskets 26, 21 are provided more securely to insure tight joints between the mounting members and the ste-m 6.

I-t is found that, in most filters such as commercially used at the present time, the oil pressure is insuicient to produce a iiow through the :filter pack of suicient volume to serve the en gine. It is, for this reason, accepted practice to provide in the bottom plate of the cartridge one or more openings through which some of the unfiltered oil may pass into the space within the filter pack, there to become mixed with the ltered oil rising through this space and to flow therewith back to the engine. This is a most unsatisfa-ctory condition which apparently cannot be avoided where the conventional type of filter pack is used. v

It was above stated that an important object of the present invention is the provision of a novel type of lter pack. This pack consists of a roll'of tissue paper, such as ordinary toilet paper, through the spaces between each layer of which the oil from the upper radial grooves 24 is free to pass, there to deposit all grit and other undesirable matter. The filtered oil is free to pass through the thin lms of the tissue paper windings into the inner space I1 and to discharge into the radial grooves 25 of the lower support `member Il, finally to rise through these grooves into the inner space Il.

The advantage of using such tissue paper roll is not only that a filter pack is provi-ded through which a suicient flow of ltered oil is obtained even at relatively low pressure, but equally as much that such lter pack is so extremely economical to use.

When it is desired to remove the lter pack, it

is merely required to unscrew the plug L13, remove portioning. It may, for example, be found Vthat the .lm pack,A as it becomes saturated expands somewhat radially. It is, for this reason, necessary that the outer annular chamber .be made wide enough to al1-ow of such expansion. Other modications may be introduced within the scope of the claims hereto appended.

-I claim:

1. In an oil filter, the combination with a conventional cylindrical lter casing having an oil inlet through its outer wall, a cover and a tubular stem axially rising from the bottom thereof, said stem having an inlet passage near-er the top thereof and a bottom outlet; of an annular shoulder on the stem near the bottom thereof, a coaxial annular support seatable on said annular shoulder, a tubular filter pack c-oaxially seatable on said support in spaced relation to said casing and stem, the support having circular ridges rising from the top thereof at its outer periphery indenting the bottom surface of the filter pack and radial grooves extending from said ridges to the space within the pack, Ia coaxial annular disc seatable on the stem above the inlet passage thereof to cover the top surface of the lter pack, said disc having circular ridges rising from the bottom surface thereof at its inner periphery and radial grooves extending from its ridges to the outer periphery thereof, a helical `compression spring on the stem resting on said disc, and means engaging the stem to clamp the cover` in position and to compress said spring.

2. In an oil filter, the combination with a conventional cylindrical filter casing having an oil inlet through its outer wall a cover and a tubular stern axially rising from the bottom thereof, said stem having an inlet passage nearer the top thereof and a bottom outlet; of an annular shoulder on the stem near the bottom thereof, a coaxial annular support seatable on said annular shoulder, a tissue paper roll coaxially seatable on said support in spaced relation to said casing and stem, the support having circular ridges rising from the top thereof at its outer periphery indenting the bottom surface of the paper roll and radial grooves extending from said ridges to the space within Vthe pack, a coaxialrannular disc seatable on the stem above the inlet passage thereof to cover Athe top surface Yofthe paper roll, said disc having circular ribs rising from the bottom surface thereof at its inner periphery and radial grooves extending from. said ribs to the outer periphery thereof,V a helical compression spring on the stem resting on said disc, and means engaging the stem to clamp the cover in position and to compress said spring.v Y

3. In an oil lter, the combination with a conventional cylindrical filter casing having an oil inletthrough its outer wall a cover and a Vtubular stem axially rising from the bottom thereof, said stem having an inlet passage nearer the top thereof and an outlet at the bottom; of an annular shoulder on the stem near the bottom thereof, a coaxial annular support disc seatable on said annular shoulder, a tubular filter packrcoaxially seatable on said support disc in spaced relation `to' said casing and stem, the outer portion-'of the disc indenting the end ofthe pack to check passage of oil therebetween, a coaxial annular disc seatable on the stem to cover the top surface of` the filter pack, the inner portion of said upper disc indenting the pack to check passage therebetween of oil descending from said casing inlet along the outer surface of the pack,.a helical compressionspring on the stem resting onV said disc,

and means engaging the stem to clamp the cover in position and to compress said spring.

4. In an oil lter, the combination with a conventional cylindrical lter casing having an oil inlet through its outer Wall a cover and a tubular stem axially rising from the bottom thereof, said stem having an inlet passage nearer the top thereof and an outlet at the bottom thereof; of an annular shoulder on the stem near the bottom thereof, a coaxial annular support disc seatable on said annular shoulder, a roll of tissue paper coaxially seatable on said support disc in spaced relation to said casing and stem, the outer portion of the support disc indenting the bottom surface of the roll to check passage therebetween of oil descending from said casing inlet along the outer surface of the roll of paper, a coaxial annular disc seatable on the stem to cover the top surface of the paper roll, the inner portion of said upper disc indenting the top surface of the roll to check passage of oil therethrough, a helical compression spring on the stem resting on said disc, and means engaging the stem to clamp the cover in position and to compress said spring.

RAYMOND G. ZENICK.

REFERENCES CTED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

